This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A261911 #24 Sep 13 2015 23:47:45 %S A261911 1099,1143,1154,1165,1176,1187,1198,1209,1264,1275,1286,1297,1308, %T A261911 1319,1385,1396,1407,1418,1429,1517,1528,1539,1638,1649,1759,10099, %U A261911 10155,10199,10299,10366,10399,10499,10577,10599,10699,10799,11809,12819,13829,14839 %N A261911 Numbers n which are neither palindromes nor the sum of two palindromes, with property that the largest palindrome which when subtracted from n yields the sum of two palindromes is not the palindromic floor of n (A261423(n)), but rather the next palindrome below that. %C A261911 These are the numbers with palindromic order 4 (see A261913). %H A261911 N. J. A. Sloane, <a href="/A261911/b261911.txt">Table of n, a(n) for n = 1..51</a> %Y A261911 Cf. A002113, A261423, A261910, A261912, A261913. %K A261911 nonn,base %O A261911 1,1 %A A261911 _N. J. A. Sloane_, Sep 10 2015